Numerical classification of curvilinear structures for the identification of pistol barrels

Manufacturing of firearms parts: Relevant sources of information and contribution in a forensic context

“…The barrels of Carl Walther are exclusively manufactured by button rifling (visit the manufacturer, 2007). This is mentioned in the literature for the PP and P99 models (Bolton-King et al, 2012a;Bonfanti & De Kinder, 1999).…”

“…An article dedicated by Garland (1987) states that the barrel of the Glock 17 model is rifled using hammer forging and the pattern of the rifling is hexagonal. The same information is mentioned in for the Glock 19 (Bolton-King et al, 2012a). As there were no other results for Glock, a search was carried out on the site of this manufacturer (https://us.glock.com).…”

“…However, even if those references describe the processes, they are not necessarily a source of information detailed enough to link a specific manufacturer—or a model—to a process. Many articles were published in the AFTE Journal, the official publication of the Association of Firearm and Tool Mark Examiners (AFTE), or in other different forensic journals: Biasotti (1981), Murdock (1981), Bonfanti (1997), Bonfanti and De Kinder (1999), Smith (2011), Bolton‐King, Bencsik, et al (2012), and Bolton‐King (2017). These articles describe the exchange of information on methods and practices concerning firearms and their manufacture, as well as to various studies on the identification of firearms using ammunition elements.…”

“…Smith (2011) when studying more than 50 different companies manufacturing firearms lists their make, model, caliber, type, and barrel rifling method. Another article Bolton‐King, Bencsik, et al (2012), comparing transitions between lands and grooves after different manufacturing processes, also includes a list of firearm models and the technique used to rifle their respective barrel. Warlow (2012) describes in his book all the different machining process which could be used in the manufacturing of firearm parts.…”

Virtual Tool Mark Generation for Efficient Striation Analysis,

“…This tool‐focused approach is relatively new. Bolton‐King et al . examined plaster casts of gun barrels but did not relate them to the fired bullets.…”